pratyaksanumanagamah pramananiYoga Sutras of Patanjali, 1.7
pratyaksa = perception
anumana = inference
agamah = received knowledge
pramanani = are the sources of knowledge
For sensory sources of direct perception, the scenery is for sight, the bird song is for hearing, the flowers for smell, the apple for taste and the feeling of being connected to the ground for touch.
The book represents received knowledge and she is looking up thinking, to represent inference.